[heap] New heuristics for starting of incremental marking.

src/heap/heap-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 169 matching lines @@
 }
 
 Address* Heap::OldSpaceAllocationTopAddress() {
   return old_space_->allocation_top_address();
 }
 
 Address* Heap::OldSpaceAllocationLimitAddress() {
   return old_space_->allocation_limit_address();
 }
 
-bool Heap::HeapIsFullEnoughToStartIncrementalMarking(intptr_t limit) {
-  if (FLAG_stress_compaction && (gc_count_ & 1) != 0) return true;
-
-  intptr_t adjusted_allocation_limit = limit - new_space_->Capacity();
-
-  if (PromotedTotalSize() >= adjusted_allocation_limit) return true;
-
-  if (HighMemoryPressure()) return true;
-
-  return false;
-}
-
 void Heap::UpdateNewSpaceAllocationCounter() {
   new_space_allocation_counter_ = NewSpaceAllocationCounter();
 }
 
 size_t Heap::NewSpaceAllocationCounter() {
   return new_space_allocation_counter_ + new_space()->AllocatedSinceLastGC();
 }
 
 template <>
 bool inline Heap::IsOneByte(Vector<const char> str, int chars) {
@@ skipping 291 matching lines @@
 bool Heap::InOldSpace(Object* object) { return old_space_->Contains(object); }
 
 bool Heap::InNewSpaceSlow(Address address) {
   return new_space_->ContainsSlow(address);
 }
 
 bool Heap::InOldSpaceSlow(Address address) {
   return old_space_->ContainsSlow(address);
 }
 
-bool Heap::OldGenerationAllocationLimitReached() {
-  if (!incremental_marking()->IsStopped() && !ShouldOptimizeForMemoryUsage()) {
-    return false;
-  }
-  return OldGenerationSpaceAvailable() < 0;
-}
-
 template <PromotionMode promotion_mode>
 bool Heap::ShouldBePromoted(Address old_address, int object_size) {
   Page* page = Page::FromAddress(old_address);
   Address age_mark = new_space_->age_mark();
 
   if (promotion_mode == PROMOTE_MARKED) {
     MarkBit mark_bit = ObjectMarking::MarkBitFrom(old_address);
     if (!Marking::IsWhite(mark_bit)) {
       return true;
     }
@@ skipping 349 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_INL_H_